长庆自主石油磺酸盐表面活性剂的研发

Development of Changqing Petroleum Sulfonate Surfactants

李文宏 范伟 孙华岭 王立成 张永强 杜朝锋

LIWenhong FANWen SUN Hualing WANG Licheng ZHANG Yongqiang DU Chaofeng

以长庆油田馏分油为原料，开展驱油用石油磺酸盐表面活性剂合成及优化研究。通过研究区流体组分-表面活性剂构效关系、原料油结构及石油磺酸盐分子设计及合成，初步确定以减三线馏分油为主原料生产石油磺酸盐，合成可使油水界面张力达10-2～10-3mN/m数量级的石油磺酸盐（浓度为2000 mg/L）小试产品。通过磺化工艺优化，确定了以气态SO3作为磺化剂，采用气相连续膜式磺化工艺进行长庆石油磺酸盐中试生产，制得了石油磺酸盐中试产品CPS-1。浓度为2000 mg/L 的CPS-1 溶液可使长庆油田MB3 区油水界面张力降低到10-2～10-3mN/m数量级，具有较高的界面活性，此外，CPS-1 溶液的pH值为7.6～8.5，可满足无碱二元驱用表面活性剂的pH值要求。图5 表6 参12

Using Changqing oilfield distillate oil as raw material，the synthesis and optimization researches of petroleum sulfonate surfactant to flooding was carried out. Through the experimental study of fluid component -surfactant activity relationship，structure characterization of raw oil and the design and synthesis of petroleum sulfonate molecule，the vacuum distillate oil as the main raw material to produce the petroleum sulfonate，was determined preliminary，and the experiment product of petroleum sulfonate was synthesized，which could make the oil-water interfacial tension decrease to 10-2-10-3 mN/m at the concentration of 2000 mg/L. At the same time，the research of sulfonated process optimization was conducted ，by which the gaseous SO3 as sulfonated agent was determined，the gas phase continuous film type as the sulfonated process to pilot production of Changqing petroleum sulfonate was utilized and the pilot product CPS-1 was obtained. The CPS-1 could reduce the oil-water interfacial tension of the MB zone in Changqing oil field to 10-2-10-3 mN/m at the CPS-1 concentration of 2000 mg/L，indicating that the CPS-1 had higher interfacial activity. In addition，the pH value of CPS-1 solution was 7.6-8.5，which could meet the requirements of the free alkali SP flooding to the pH value of surfactants.